private void clearAllToolStripMenuItem_Click(object sender, EventArgs e)
{
DialogResult result = MessageBox.Show(
"Do you want to clear (delete) these keys? This cannot be undone.",
"Clear keys?",
MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
if (result != DialogResult.OK)
{
return;
}
KeyCollection.DeleteItemRange(new List <KeyCollectionItem>(KeyCollection.Items));
}